CN106452090A - Closed-loop control system for LLC half-bridge resonance converter and system-control method - Google Patents
Closed-loop control system for LLC half-bridge resonance converter and system-control method Download PDFInfo
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- CN106452090A CN106452090A CN201611062870.7A CN201611062870A CN106452090A CN 106452090 A CN106452090 A CN 106452090A CN 201611062870 A CN201611062870 A CN 201611062870A CN 106452090 A CN106452090 A CN 106452090A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
- H02M7/4818—Resonant converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to a closed-loop control system for a LLC half-bridge resonance converter and a system-control method thereof. The closed-loop control system comprises an input power of a main circuit, a switch module, a resonant network module, a transformer, a rectification circuit block, a filter circuit module, a load, a control system of PID, and a voltage controlled oscillator (VCO). The closed-loop control method comprises the steps of: starting the control system of PID by an unstable output voltage signal, adjusting the output voltage, and stabilizing the output voltage. According to the closed-loop control system and the system-control method, the output voltage is adjusted by changing the operating frequency of the LLC half-bridge resonance and the closed-loop controls are associated, therefore the voltage of the LLC half-bridge resonance is steady to increase working efficiency when a switching tube works in a reasonably frequency range.
Description
Technical field
The present invention relates to the control technology field of LLC half bridge resonant, particularly a kind of LLC half bridge resonant
Closed-loop control system and control method.
Background technology
21 century is the informationalized epoch, and informationalized fast development makes people for the dependence of electronic equipment, product
Property is increasing, and these electronic equipments, product all be unable to do without power supply.Switching Power Supply has efficiency, body with respect to linear power supply
The advantage of the aspects such as long-pending, weight, especially high frequency switch power are just becoming lighter, and less, in hgher efficiency, also more reliable, this makes
Obtaining high frequency switch power becomes most widely used power supply.From the point of view of the composition of Switching Power Supply, it is mainly made up of two parts：
Power stage and controlled stage.The main task of power stage is according to different application scenarios and requirement, selects different topological structures,
Take into account semiconductor element simultaneously and consider design cost；The main task of controlled stage is then to select suitable control according to circuit electric signal
Mode processed, current Switching Power Supply is in the majority with PWM control mode.
Switch converters development is swift and violent, it is also proposed requirements at the higher level to the power output and output voltage of Switching Power Supply.Example
As the power bracket of Switching Power Supply needed for liquid crystal TV set (LCD TV) of 32～52in has reached 120～300W.And 56in with
The power of upper liquid crystal TV set can exceed 350W.Power output due to single-end flyback switching power supply is usually no more than
70W, the power output of both-end inverse-excitation type switch power-supply is generally 120～180W, all cannot meet above-mentioned requirements.Half-bridge LLC is humorous
The converter that shakes has that output power (150～180W), required component number be few, high performance-price ratio, high efficiency (up to 99%),
The advantages of output voltage stabilization, be the optimal selection making giant-screen and jumbotron LCD TV Switching Power Supply.Half-bridge LLC is humorous
The converter that shakes applies also for the fields such as PC power source, LED street lamp, the power supply system for communications, industry, Medical Devices.Half-bridge logical link control (LLC) resonant becomes
The typical products of parallel operation integrated circuit have the L6599 of PLC810PG, ST company of PI Corp.'s production, ON company to produce
NCP1395 and NCP1396.Using PI Expert8.5 software, the design work of PLC810PG can be completed, including according to user certainly
The output loading of definition and nominal switching frequency, automatically select series connection and parallel resonance component value；Guarantee in all loading conditions
Under realize ZVT (ZVS)；Automatically calculate the loss of PFC and LLC major power device and show set to graphically
The switching frequency of meter, power output and output voltage etc..
Giant-screen and jumbotron liquid crystal TV set industry just obtain and develop rapidly at present.20th century early fifties, from
Sharp push pull transistor single phase transformer DC converter, the invention of self-excitation push-pull type dual transformer and use, and the sixties
The proposition of mid-term no industrial frequency transformer formula Switching Power Supply design is it is achieved that the control work(to high frequency conversion for the switch converters
Can, promote the development of switch converters；The 80s and 90s in 20th century, adjust (PWM) controller and monolithic with pulse width
The appearance of machine Switching Power Supply and use, Switching Power Supply is become increasingly popular and is promoted.Meanwhile, Switching Power Supply is just towards electricity
Press stable, safe and efficient, energy-conserving and environment-protective direction to develop, that is, require to carry out effective closed-loop control to switch converters.
But, nowadays there are many problems in the switch converters in market, is mainly manifested in：Resonant groove path interior resonance parameter
Design is complicated, transformer leakage inductance need to be dealt carefully with, conventional inverter PFM controls unloaded when resonant groove path in electric current big, loss is sternly
Weight, short-circuit protection etc. are compared with being difficult to solve, converter dynamic response is slow and control circuit high cost, delivery efficiency are low, output is electric
The problems such as press unstable.For solving problem above, design the closed-loop control system of a set of reliable and stable switch converters very
Important.
Content of the invention
It is an object of the invention to provide a kind of closed-loop control system of LLC half bridge resonant and control method, with
Overcome defect present in prior art.
For achieving the above object, the technical scheme is that：A kind of closed-loop control system of LLC half bridge resonant
System, including：The circuit input power that is sequentially connected, switch module, resonant network module, transformer, rectification filtering module and
Load；Described load connects to PID control system；Described PID control system is connected with a VCO；Described VCO and described switching molding
Block is connected；Described main circuit input power is dc source, is converted to square wave by described switch module, and as resonant tank
Input；Described switch module includes the switching tube of two complementary conductings, forms half-bridge structure；Described resonant network module includes
One resonant inductance and a resonant capacitance, are that LLC half bridge resonant provides two resonant frequencies, respectively series resonance frequency
Rate and parallel resonance frequency；Described transformer is high frequency transformer, and its primary side is connected with described resonant network module；Described
Rectification filtering module is connected with the secondary side of described transformer, and described rectification filtering module includes forming band by two diodes
The filter circuit being made up of full-wave rectifying circuit and some filter capacitors of center transformer；Described transformer output voltage passes through
After described rectification filtering module, resupply described load and use, and output voltage signal is sent to described PID control system；
Described PID control system is used for transmitting voltage signal to described VCO, and described VCO controls described switching molding according to this voltage signal
Block.
In an embodiment of the present invention, described PID control system through division module with described load be connected, and also with a base
Quasi- voltage module is connected；Described output voltage signal after described division module, adopt by the voltage as described PID control system
Sample value；The reference voltage value that described PID control system is provided by described reference voltage module is calculated with described voltage sample value
The error originated from input adjusting for LLC resonant converter PID.
In an embodiment of the present invention, described VCO is connected with described switch module through one drive circuit, and also anti-phase with one
Device is connected；Described VCO receives after the voltage signal of described PID control system feedback, with described phase inverter collective effect, exports
Dutycycle is 50%, the two-way square-wave signal of 180 ° of phase；Again through described drive circuit, two switching tubes are controlled to replace
Turn-on and turn-off.
Further, a kind of control method of the closed-loop control system of LLC half bridge resonant, described PID are also provided
Control system is connected with VCO, constitutes the control loop of LLC half bridge resonant；The voltage that described VCO receives feedback and comes
Signal, using the complementary frequency modulation working method in fixing dead band, to adjust the operating frequency of switching tube, by changing the work of switching tube
Working frequency, to adjust the energy output of transformer, and then to change the output voltage values of LLC half bridge resonant.
In an embodiment of the present invention, PID regulation parameter is preset by described PID control system, including proportionality coefficient, amass
Divide time constant and derivative time constant.
In an embodiment of the present invention, the work of the closed-loop control system of the control loop of described LLC half bridge resonant
Make mode as follows：
When described PID control system receives unstable output voltage signal,
After described PID control system receives the output voltage signal of rising that described load provides, by described partial pressure
Module obtains voltage sample value；And the reference voltage being provided with described reference voltage module according to described voltage sample value is inclined
Difference, sends voltage signal to described VCO, changes the input voltage of described VCO, thus reducing the frequency of described VCO output waveform；
Electric signal is exported by described VCO, adjusts, through described drive circuit, the operating frequency reducing switching tube, reduce half-bridge logical link control (LLC) resonant
The voltage gain of converter, and then reduce the output voltage of LLC half bridge resonant；Meanwhile, described PID control system receives
The output voltage signal of offer is provided described in subsequent time, then sends real-time voltage signal to described VCO, with bearing that this is constituted
Feedback, to realize frequency modulation and voltage modulation, makes output voltage reach stable；
After described PID control system receives the output voltage signal of reduction that described load provides, by described partial pressure
Module obtains voltage sample value；And the deviation according to voltage sample value and the reference voltage of described reference voltage module offer, to
Described VCO sends voltage signal, changes the input voltage of described VCO, thus raising the frequency of described VCO output waveform；By institute
State VCO output electric signal, adjust, through described drive circuit, the operating frequency raising switching tube, increase half-bridge logical link control (LLC) resonant conversion
The voltage gain of device, and then raise the output voltage of LLC half bridge resonant；Meanwhile, described PID control system receives next
The output voltage signal of offer was provided described in the moment, then sends real-time voltage signal, the negative-feedback being constituted with this to described VCO
To realize frequency modulation and voltage modulation, so that output voltage is reached stable；
When described PID control system receives stable output voltage, described VCO output waveform frequency is constant, thus
The operating frequency of switching tube is constant it is ensured that output voltage stabilization is constant.
In an embodiment of the present invention, the voltage gain of described LLC half bridge resonant：
Wherein,
For series resonance frequency；
For parallel resonance frequency；
For quality factor；
For inductance coefficent；
For normalized frequency；
CrFor resonant capacitance, LrFor resonant inductance, LmFor the magnetizing inductance of transformer, n is the turn ratio of transformer, RLIt is negative
Carry resistance, f is the operating frequency of switching tube.
Compared to prior art, the invention has the advantages that：
(1) this system can act on to realizing the pressure regulation to converter, and passing ratio-Integrated Derivative (PID) controls
System and VCO realize closed-loop control.The closed-loop control system PID control system that the design is related to, has that principle is simple, adaptability
With strong robustness, few to the dependence of model, the advantages of easy to use.
(2) PID control system, after receiving the signal of the rising of load end output voltage or reduction, sends electricity to VCO
Pressure signal, changes the input voltage of VCO；The voltage signal that VCO feeds back according to PID control system and comes exports corresponding telecommunications
Number, then the operating frequency through overdrive circuit regulation switching tube, and then the output voltage of change converter, make the output of converter
Voltage reaches stable；
(3) collective effect of PID control system and VCO, makes switching tube be operated in rational frequency range it is achieved that opening
The no-voltage closing pipe is opened and is exported the zero-current switching of commutation diode, improves the operating efficiency of converter.
Brief description
Fig. 1 is the schematic diagram of the closed-loop control system of LLC half bridge resonant in the present invention.
Fig. 2 is the circuit diagram of LLC half bridge resonant in one embodiment of the invention.
Fig. 3 is the circuit diagram of the closed-loop control system of LLC half bridge resonant in one embodiment of the invention.
Fig. 4 is the voltage oscillogram at one embodiment of the invention breaker in middle pipe two ends.
Fig. 5 is the current waveform figure exporting commutation diode in full-wave rectifying circuit in one embodiment of the invention.
Fig. 6 is the oscillogram of output voltage signal in one embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
A kind of closed-loop control system of LLC half bridge resonant of the present invention, as shown in figure 1, comprise main circuit input electricity
Source (dc source) 11, switch module 12, resonant network module 13, transformer 14, current rectifying and wave filtering circuit module 15, load 16,
Division module 21, PID control system 31, VCO 32, drive circuit module 22, reference voltage module 41, phase inverter 42.
Further, in the present embodiment, as shown in figures 2-3, main circuit input power 11 is dc source, and passes through
Described switch module 12 is converted to square wave, as the input of resonant tank；Described switch module 12 is opened by two complementary conductings
Close pipe to constitute, form half-bridge structure；Described resonant network module 13 is become with resonance capacitance group by resonant inductance, and thus defines
Two resonant frequencies of LLC half bridge resonant, respectively series resonance frequency and parallel resonance frequency；Described transformer 14
For high frequency transformer, its primary side is connected with described resonant network module；Described current rectifying and wave filtering circuit module N is in described transformation
Device secondary side, forms, by two diodes, the filtering that the full-wave rectifying circuit carrying center transformer and some filter capacitors form
Circuit is constituted；Described transformer output voltage, after described current rectifying and wave filtering circuit module 15, resupplies described load 16 use,
And output voltage signal is sent to described PID control system 31.
Further, in the present embodiment, PID control system 31 is connected with VCO32, constitutes half-bridge logical link control (LLC) resonant conversion
The control loop of device；Described PID control system 31 is used for transmitting voltage signal to described VCO32；Described VCO32 receive feedback and
The voltage signal coming, using the complementary frequency modulation working method in fixing dead band, to adjust the operating frequency of switching tube, to be opened by changing
Close the operating frequency of pipe, to adjust the energy output of transformer, and then to change the output voltage values of converter；The work of switching tube
Frequency depends on the demand of the power output to described control loop；When the power output of described control loop is relatively low, switch
The operating frequency of pipe can be at a relatively high；When the power output of described control loop is higher, control loop can reduce switching tube automatically
Operating frequency.Because switching tube is operated in rational frequency range it is achieved that the no-voltage of switching tube is opened and exported whole
The zero-current switching of stream diode, improves the operating efficiency of converter.
Further, in the present embodiment, in the present embodiment, PID control system 31 is also associated with reference voltage module 41
With division module 21；Output voltage after described division module 21, as the voltage sample measured value of PID control system 31；
Output voltage set-point and voltage sample value determine the error originated from input of PID control system 31；According to described error originated from input, complete
The PID of LLC resonant converter is adjusted.
Further, in the present embodiment, VCO 32 is also associated with phase inverter 42 and drive circuit module 22；VCO 32 connects
Receive after the voltage signal that PID control system 31 feeds back, and described phase inverter 42 collective effect, output duty cycle is
50%th, the two-way square-wave signal of 180 ° of phase；Again through described drive circuit module 22, two switching tubes are made alternately to lead
Lead to and turn off.
Further, in the present embodiment, the inner setting of PID control system 31 has PID regulation parameter, including ratio system
Number, integration time constant and derivative time constant；When PID control system 31 receives the signal of load end output voltage reduction
When, or when PID control system 31 receives the signal that load end output voltage raises, there is input by mistake in PID control system 31
Difference；PID control system 31 is started working, and adjusts output voltage, so that output voltage is reached stable.
Further, in the present embodiment, the specific works side of the closed-loop control system of described LLC half bridge resonant
Formula is as follows,
When PID control system receives unstable output voltage signal,
After PID control system receives the signal of load end output voltage rising, according to voltage sample value and reference voltage
Deviation size, to VCO 32 send voltage signal, change VCO 32 input voltage, thus reducing VCO 32 output waveform
Frequency；The electric signal being exported by VCO 32 adjusts, through overdrive circuit, the operating frequency reducing switching tube again, reduces converter
Voltage gain, and then reduce the output voltage of converter, meanwhile, PID control system 31 receives the load output electricity of subsequent time
Pressure signal, then send real-time voltage signal to VCO32, frequency modulation and voltage modulation is realized with the negative-feedback that this is constituted, finally makes output
Voltage reaches stable；
After PID control system 31 receives the signal of load end output voltage reduction, according to voltage sample value and benchmark electricity
The deviation size of pressure, sends voltage signal to VCO32, changes the input voltage of VCO32, thus raising VCO32 output waveform
Frequency；The electric signal being exported by VCO32 adjusts, through overdrive circuit, the operating frequency raising switching tube again, increases the electricity of converter
Pressure gain, and then the output voltage of Raise transform device, meanwhile, PID control system 31 receives the load output voltage of subsequent time
Signal, then send real-time voltage signal to VCO 32, frequency modulation and voltage modulation is realized with the negative-feedback that this is constituted, finally makes output electricity
Pressure reaches stable；
When PID control system 31 receives stable output voltage, VCO32 output waveform frequency is constant, thus switching
Operating frequency constant it is ensured that output voltage stabilization is constant.
Further, in the present embodiment, the closed-loop control system of LLC half bridge resonant, has voltage gain (normalizing
Change voltage gain)：
Wherein,
For series resonance frequency；
For parallel resonance frequency；
For quality factor；
For inductance coefficent；
For normalized frequency；
In formula, CrFor resonant capacitance, LrFor resonant inductance, LmFor T1Magnetizing inductance, n be high frequency transformer the turn ratio,
RLFor load resistance, f is the operating frequency of switching tube.
Further, as shown in figures 4-6, operating frequency f of switching tube is adjusted by VCO.As output voltage V0Raise
When, f ↓ → G ↓ → V0↓, finally make V0Reach stable.Conversely, working as output voltage V0During reduction, f ↑ → G ↑ → V0↑, equally also can make
V0Tend towards stability.
It is more than presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function is made
With without departing from technical solution of the present invention scope when, belong to protection scope of the present invention.
Claims (7)
1. a kind of closed-loop control system of LLC half bridge resonant is it is characterised in that include：The circuit input being sequentially connected
Power supply, switch module, resonant network module, transformer, rectification filtering module and load；Described load connects to PID control
System；Described PID control system is connected with a VCO；Described VCO is connected with described switch module；Described main circuit input power
For dc source, square wave, and the input as resonant tank are converted to by described switch module；Described switch module includes two
The switching tube of individual complementary conducting, forms half-bridge structure；Described resonant network module includes a resonant inductance and a resonant capacitance, is
LLC half bridge resonant provides two resonant frequencies, respectively series resonance frequency and parallel resonance frequency；Described transformation
Device is high frequency transformer, and its primary side is connected with described resonant network module；Described rectification filtering module and described transformer
Secondary side be connected, and described rectification filtering module include form full-wave rectification with center transformer by two diodes electric
Road and the filter circuit of some filter capacitors composition；Described transformer output voltage is after described rectification filtering module, then supplies
Use to described load, and output voltage signal is sent to described PID control system；Described PID control system is used for transmitting
Voltage signal gives described VCO, and described VCO controls described switch module according to this voltage signal.
2. a kind of closed-loop control system of LLC half bridge resonant according to claim 1 is it is characterised in that described
PID control system is connected with described load through division module, and is also connected with a reference voltage module；Described output voltage signal
After described division module, as the voltage sample value of described PID control system；Described PID control system passes through described base
The reference voltage value that quasi- voltage module provides and described voltage sample value calculate the input adjusting for LLC resonant converter PID
Error.
3. a kind of closed-loop control system of LLC half bridge resonant according to claim 2 is it is characterised in that described
VCO is connected with described switch module through one drive circuit, and is also connected with a phase inverter；Described VCO receives from described PID control
After the voltage signal of system feedback, with described phase inverter collective effect, output duty cycle is 50%, the two-way of 180 ° of phase
Square-wave signal；Again through described drive circuit, the alternate turn-on and turn-off of two switching tubes of control.
4. a kind of control method of the closed-loop control system based on a kind of LLC half bridge resonant described in claim 3, its
It is characterised by, described PID control system is connected with VCO, constitute the control loop of LLC half bridge resonant；Described VCO connects
The voltage signal received feedback and come, using the complementary frequency modulation working method in fixing dead band, to adjust the operating frequency of switching tube, to lead to
Cross the operating frequency changing switching tube, to adjust the energy output of transformer, and then to change the output of LLC half bridge resonant
Magnitude of voltage.
5. the control method of the closed-loop control system of a kind of LLC half bridge resonant according to claim 4, its feature
It is：PID regulation parameter is preset by described PID control system, normal including proportionality coefficient, integration time constant and derivative time
Number.
6. the control method of the closed-loop control system of a kind of LLC half bridge resonant according to claim 4, its feature
It is, the working method of the closed-loop control system of the control loop of described LLC half bridge resonant is as follows：
When described PID control system receives unstable output voltage signal,
After described PID control system receives the output voltage signal of rising that described load provides, by described division module
Obtain voltage sample value；And the deviation according to described voltage sample value and the reference voltage of described reference voltage module offer, to
Described VCO sends voltage signal, changes the input voltage of described VCO, thus reducing the frequency of described VCO output waveform；By institute
State VCO output electric signal, adjust, through described drive circuit, the operating frequency reducing switching tube, reduce half-bridge logical link control (LLC) resonant conversion
The voltage gain of device, and then reduce the output voltage of LLC half bridge resonant；Meanwhile, described PID control system receives next
The output voltage signal of offer was provided described in the moment, then sends real-time voltage signal, the negative-feedback being constituted with this to described VCO
To realize frequency modulation and voltage modulation, so that output voltage is reached stable；
After described PID control system receives the output voltage signal of reduction that described load provides, by described division module
Obtain voltage sample value；And the deviation of the reference voltage being provided with described reference voltage module according to voltage sample value, to described
VCO sends voltage signal, changes the input voltage of described VCO, thus raising the frequency of described VCO output waveform；By described VCO
Output electric signal, adjusts the operating frequency raising switching tube, increases the electricity of LLC half bridge resonant through described drive circuit
Pressure gain, and then raise the output voltage of LLC half bridge resonant；Meanwhile, described PID control system receives subsequent time institute
State the output voltage signal that load provides, then send real-time voltage signal to described VCO, to be realized with the negative-feedback that this is constituted
Frequency modulation and voltage modulation, makes output voltage reach stable；
When described PID control system receives stable output voltage, described VCO output waveform frequency is constant, thus switching
The operating frequency of pipe is constant it is ensured that output voltage stabilization is constant.
7. the control method of the closed-loop control system of a kind of LLC half bridge resonant according to claim 6, its feature
It is, the voltage gain of described LLC half bridge resonant：
Wherein,
For series resonance frequency；
For parallel resonance frequency；
For quality factor；
For inductance coefficent；
For normalized frequency；
CrFor resonant capacitance, LrFor resonant inductance, LmFor the magnetizing inductance of transformer, n is the turn ratio of transformer, RLFor load electricity
Resistance, f is the operating frequency of switching tube.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425722A (en) * | 2017-05-09 | 2017-12-01 | 中国石油大学(华东) | A kind of LLC resonant converter frequency modulation phase shift current-sharing control method in parallel |
| CN107612406A (en) * | 2017-09-06 | 2018-01-19 | 深圳市艾尔曼医疗电子仪器有限公司 | The non-constant frequency intermediate frequency power supply of capacitive variable load inversion high pressure and its mu balanced circuit |
| CN108023486A (en) * | 2018-01-16 | 2018-05-11 | 中国科学院上海微系统与信息技术研究所 | A kind of LLC resonant half-bridge converters |
| CN108990216A (en) * | 2018-08-31 | 2018-12-11 | 大连昌正光电科技有限公司 | A kind of LED lamp power supply device and its light-dimming method |
| CN109412418A (en) * | 2018-09-04 | 2019-03-01 | 易事特集团股份有限公司 | Calculation method, device, computer and the storage medium of LLC commutator transformer parameter |
| WO2019047056A1 (en) * | 2017-09-06 | 2019-03-14 | 深圳市艾尔曼医疗电子仪器有限公司 | Capacitive variable-load inverter high-voltage non-constant-frequency intermediate-frequency power supply and voltage-stabilizing circuit thereof |
| CN110061639A (en) * | 2019-03-26 | 2019-07-26 | 深圳市航嘉聚源科技股份有限公司 | A kind of output adjustable power circuit |
| CN110588395A (en) * | 2019-09-09 | 2019-12-20 | 国网山东省电力公司金乡县供电公司 | Vehicle-mounted charger control circuit and method, charger and electric vehicle |
| CN111166925A (en) * | 2020-03-06 | 2020-05-19 | 深圳国创名厨商用设备制造有限公司 | Magnetoelectric induction air disinfection equipment |
| CN111193437A (en) * | 2018-11-15 | 2020-05-22 | 北京自动化控制设备研究所 | Ultrasonic motor LC resonance matching circuit with feedback loop |
| CN111464035A (en) * | 2020-04-28 | 2020-07-28 | 青岛市中心医院 | Non-contact voltage regulating circuit and voltage regulating method of high-voltage isolation type medical power supply |
| CN111464060A (en) * | 2020-05-07 | 2020-07-28 | 北京聚能合源科技有限公司 | Linear alternating current power supply conversion device and control method thereof |
| CN111865091A (en) * | 2020-07-27 | 2020-10-30 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply and electrical equipment |
| CN113346774A (en) * | 2021-07-14 | 2021-09-03 | 合肥工业大学 | LLC converter control method based on input voltage feedback |
| CN117277787A (en) * | 2023-09-25 | 2023-12-22 | 苏州博沃创新能源科技有限公司 | High-voltage wide-voltage-range input power DC-DC converter and control method |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425722A (en) * | 2017-05-09 | 2017-12-01 | 中国石油大学(华东) | A kind of LLC resonant converter frequency modulation phase shift current-sharing control method in parallel |
| CN107612406A (en) * | 2017-09-06 | 2018-01-19 | 深圳市艾尔曼医疗电子仪器有限公司 | The non-constant frequency intermediate frequency power supply of capacitive variable load inversion high pressure and its mu balanced circuit |
| WO2019047056A1 (en) * | 2017-09-06 | 2019-03-14 | 深圳市艾尔曼医疗电子仪器有限公司 | Capacitive variable-load inverter high-voltage non-constant-frequency intermediate-frequency power supply and voltage-stabilizing circuit thereof |
| CN108023486A (en) * | 2018-01-16 | 2018-05-11 | 中国科学院上海微系统与信息技术研究所 | A kind of LLC resonant half-bridge converters |
| CN108990216A (en) * | 2018-08-31 | 2018-12-11 | 大连昌正光电科技有限公司 | A kind of LED lamp power supply device and its light-dimming method |
| CN109412418A (en) * | 2018-09-04 | 2019-03-01 | 易事特集团股份有限公司 | Calculation method, device, computer and the storage medium of LLC commutator transformer parameter |
| CN111193437A (en) * | 2018-11-15 | 2020-05-22 | 北京自动化控制设备研究所 | Ultrasonic motor LC resonance matching circuit with feedback loop |
| CN111193437B (en) * | 2018-11-15 | 2022-04-12 | 北京自动化控制设备研究所 | Ultrasonic motor LC resonance matching circuit with feedback loop |
| CN110061639A (en) * | 2019-03-26 | 2019-07-26 | 深圳市航嘉聚源科技股份有限公司 | A kind of output adjustable power circuit |
| CN110588395B (en) * | 2019-09-09 | 2021-01-12 | 国网山东省电力公司金乡县供电公司 | Vehicle-mounted charger control circuit and method, charger and electric vehicle |
| CN110588395A (en) * | 2019-09-09 | 2019-12-20 | 国网山东省电力公司金乡县供电公司 | Vehicle-mounted charger control circuit and method, charger and electric vehicle |
| CN111166925A (en) * | 2020-03-06 | 2020-05-19 | 深圳国创名厨商用设备制造有限公司 | Magnetoelectric induction air disinfection equipment |
| CN111464035A (en) * | 2020-04-28 | 2020-07-28 | 青岛市中心医院 | Non-contact voltage regulating circuit and voltage regulating method of high-voltage isolation type medical power supply |
| CN111464060B (en) * | 2020-05-07 | 2021-04-06 | 北京聚能合源科技有限公司 | Linear alternating current power supply conversion device and control method thereof |
| CN111464060A (en) * | 2020-05-07 | 2020-07-28 | 北京聚能合源科技有限公司 | Linear alternating current power supply conversion device and control method thereof |
| CN111865091A (en) * | 2020-07-27 | 2020-10-30 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply and electrical equipment |
| CN111865091B (en) * | 2020-07-27 | 2024-01-12 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply and electrical equipment |
| CN113346774A (en) * | 2021-07-14 | 2021-09-03 | 合肥工业大学 | LLC converter control method based on input voltage feedback |
| CN113346774B (en) * | 2021-07-14 | 2022-10-21 | 合肥工业大学 | LLC converter control method based on input voltage feedback |
| CN117277787A (en) * | 2023-09-25 | 2023-12-22 | 苏州博沃创新能源科技有限公司 | High-voltage wide-voltage-range input power DC-DC converter and control method |
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